package com.ypz.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.ypz.reggie.common.MyBaseContext;
import com.ypz.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成登陆
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        //定义不需要处理的请求路径
        String[] urls = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                //"/common/**"
                //连接前面要有斜杠不然不生效
                "/user/sendMsg",//移动端发送短信
                "/user/login",//移动端登录
                "/doc.html",//Swagger需要的
                "/webjars/**",//Swagger需要的
                "/swagger-resources",//Swagger需要的
                "/v2/api-docs"//Swagger需要的
        };

        //2、判断本次请求是否需要处理
        boolean check = check(requestURI, urls);

        //3、如果不需要处理，则直接放行
        if (check) {
            filterChain.doFilter(request, response);
            return;
        }

        //4-1、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            //将当前用户id放入线程,要在filterChain.doFilter(request, response)之前放入线程
            Long currentId = (Long) request.getSession().getAttribute("employee");
            MyBaseContext.setCurrentId(currentId);

            filterChain.doFilter(request, response);

            return;
        }

        //4-2、判断移动登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            //将当前用户id放入线程,要在doFilter之前放入线程
            Long userId = (Long) request.getSession().getAttribute("user");
            MyBaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);

            return;
        }

        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    /**
     * 检查请求路径是否是放行路径，是就返回true。
     *
     * @param requestURI
     * @param urls
     * @return
     */
    public boolean check(String requestURI, String[] urls) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match)
                return true;
        }
        return false;
    }
}
